66638101267 has 4 divisors (see below), whose sum is σ = 66641076216. Its totient is φ = 66635126320.

The previous prime is 66638101261. The next prime is 66638101289. The reversal of 66638101267 is 76210183666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66638101267 - 2³ = 66638101259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66638101261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1453618 + ... + 1498759.

It is an arithmetic number, because the mean of its divisors is an integer number (16660269054).

Almost surely, 2^66638101267 is an apocalyptic number.

66638101267 is a deficient number, since it is larger than the sum of its proper divisors (2974949).

66638101267 is a wasteful number, since it uses less digits than its factorization.

66638101267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2974948.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 66638101267 in words is "sixty-six billion, six hundred thirty-eight million, one hundred one thousand, two hundred sixty-seven".